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    <script>
        /**
         *  函数的返回值还是一个函数
         * 
         */

        function sum(a,b,c){
            return a + b + c;
        }
        console.log(sum(1,2,3));

        // 柯里化函数 高阶函数
        function higherSum(a){
            return function (b){
                return function (c){
                    return a + b + c;
                }
            }
        }

        console.log(higherSum(1)(2)(3));
    </script>
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